A kind of matting transparent polyester resin composition and its preparation method and application
A technology of polyester resin and composition, applied in the field of polyester resin, can solve the problems of large difference in structure of polyester resin, poor transparency of coating film, poor mechanical properties, etc., and achieve high glass transition temperature and good storage stability. , the effect of excellent mechanical properties
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[0071] The preparation method of the high acid value carboxyl-terminated polyester resin A of embodiment 1~5 comprises the steps:
[0072] 1) Add polyhydric alcohol into a 5L reactor, heat until the material melts, add polybasic acid and esterification catalyst, and carry out esterification reaction under the condition of cutting off oxygen. More specifically, after adding polybasic acid and esterification catalyst to the molten polyol, the temperature is raised to 180°C within 1 hour, then to 210°C within 2 hours, kept for 1.5 hours, to 220°C within 1 hour, and to 240-250°C, keep warm for 3 hours, react until the acid value is 6-12mgKOH / g, then vacuumize to -0.098MPa, until the acid value is 2-8mgKOH / g, and obtain the esterified product.
[0073] 2) Under the condition of cutting off oxygen, add an acidolysis agent to the esterification product to carry out the acidolysis reaction, and react at about 235°C for 2-3 hours until the acid value is 58-64 mgKOH / g to obtain the acid...
Embodiment 8～12
[0086] Embodiment 8~12 The preparation method of low acid value end carboxyl group polyester resin B comprises the steps:
[0087] 1) Add polyhydric alcohol into a 5L reactor, heat until the material melts, add polybasic acid and esterification catalyst, and carry out esterification reaction under the condition of cutting off oxygen. More specifically, after adding polybasic acid and esterification catalyst to the molten polyol, the temperature is raised to 180°C within 1 hour, then to 210°C within 2 hours, kept for 1.5 hours, and then raised to 220°C within 1 hour, Raise the temperature to 240-250°C within 2 hours, keep it warm for 3 hours, react until the acid value is 6-10mgKOH / g, then vacuumize to -0.098MPa, until the acid value is 2-6mgKOH / g, and obtain the esterified product.
[0088] 2) Under the condition of cutting off oxygen, add an acidolysis agent to the esterification product for acidolysis reaction, react at 235°C for 2-3 hours until the acid value is 30-36mgKOH / ...
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